polygenic
down syndrome
This is called co-dominance. This is when 2 or more alleles are expressed at the same time. In other words they both affect the phenotype. In the example of human blood ABO type we have an allele for A = IA, B= Ib O=i
IAIb = AB blood type
IbIb = B blood type
Iai = A
IaIa = A bloody type
Ibi = B blood type
ii = O blood type
dihybrid cross
cystic fibrosis (:
cystic fibrosis :)
cystic fibrosis ^-^
Two different alleles for the same trait are heterozygous.
No, Its homozygous. This answer is incorrect as homo = same.
non disjunction of sex chromosomes
A+ Neither parent can have type O blood
Mental retardation